In other news, Walker has been cleared to practice after being seriously injured last month during a robbery in Las Vegas. Walker was discovered unconscious and beaten on a back street near the Las Vegas Strip following a night of partying. Walker was treated at a hospital for a concussion and facial injuries.

Walker declined to address the topic, saying it was too soon to talk about it. He said he doesn’t believe his reputation took a hit because of the incident in Las Vegas.

“You know you want to look at my reputation as far as an organization or a team, like I said, you can’t find any charges against me,” Walker said. “Everybody knows my personality off the field. When it comes to what I feel I believe, and what I want to do, I just stand up for it, and from what I know, I think that is right.”

The Raiders are counting heavily on Walker after signing him to a six-year, $55 million deal after the Denver Broncos released him in February.

Walker will only practice once a day at the start of camp because he is still recovering from a knee injury sustained last season. Walker said he has lost 15 pounds since he was last with the team and Kiffin said he is in better physical shape than he had been in the spring.

“We’re just happy that in the end he was able to work through it, play again, and that he’s safe, and he needs to have a really big year, and he knows that,” Kiffin said. “I think he’s put it behind him, and he’s come back, obviously, weight wise, and body fat wise, than he was before.”

Notes: The Raiders will host a joint practice with the 49ers on Aug. 4 — four days before their exhibition opener against each other. ... WR Ronald Curry (foot), DT Tommy Kelly (knee), C Jake Grove (knee) and S Jarrod Cooper (knee) will also be limited to one practice per day until further notice. ... The Raiders released QBs Sam Keller and Jeff Otis, and DL Tranell Morant.

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